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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2871fff5c3311f10124fa53c8b5ae11faeda4ca4ba0cfaf4861f04b481d6e6fb' 
  AND token = 'kZXC9I2zJrybQXuOpl4GGOJTi4UjmoRPjovBhyTbVXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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