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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03094a9c0ca747ab8573f164c2f2469d610c3eaa100a90f5de18a2c8dee10d65' 
  AND token = 'hwfuTJA28JlX3PQVPvjmq4eaxEpNlEhCD1BfFaEsOIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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