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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f64843ceab2459cf8b09413a6e46d9aa73acd5bdba0f8250de6451d9c139f9d2' 
  AND token = 'g6Sn9i+iacpGjNEOH4xCt5IcxcEwFXwrzm1AxBD90fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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