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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f23e5cd1fa568b62525ed8bb3022b93e68d90bc2c4b393ef180f14db331c0eb6' 
  AND token = 'nn+y6YPGiKYaE/C4vLAYWYoduCHfiaVArmDuH+BrNdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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