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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96597d75d36c74e84dd03b7e3ae223a7e3eb6bffc032e82e71a649f45d64e6f7' 
  AND token = 'ViN7kLYi/1gGqqAcGNBNXbPoH5JXo6Jz8axeeNQiquk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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