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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ef72471eb41fd146e1b3a0acf6f324c9a320058ddef7b33480e7efd3884b410' 
  AND token = 'dD2hAQgeHwi5H3NIdbboSbvYW8nRr0d9iTmjAkqRNH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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