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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ef3b1b97c002210637d21ce6ea646941b5142e2fb6556aa1681157ab10ada80' 
  AND token = 'sd1H3zr0XeMqqRWPZWk5F1F59dMxAHPlPyLRGhh3rLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}