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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed834a9af0126388f5d4aad20542a6547a13d120020d04a0cde44f69bcfa029d' 
  AND token = 'l+WTWsCwHAbTgW0TcoGuT2tkV3Ow8F0r/sP/BOxU/N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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