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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a02cdc86a9d0fff1292c10072ccf7a4936b1c6915da9245cc8b8eb5793bab383' 
  AND token = 'rHoF0Ob+UA405PGCV4pDKIQXEUhlKtx4cbF9fCJuJrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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