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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e1247a482ba38907830b12b258b01ebb6937c698079d941300c9acbd2700b40' 
  AND token = 'HzQQL+uNwUBrzHu+LfdtAaU4vQVQOuwYlQF0Gs+yGFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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