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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ef63cc0491f2fe262b0b4426181e55fa678cfd216785d894740553bcdae5b07' 
  AND token = 'Cxc8dZlff5OCEit/liy/h+b1iLOn6ptSuFnm6gMhBfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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