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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '713e5d1a0d41b3342f252238a675443c5eef6fc5747b12486d50f4babf0d6f2c' 
  AND token = '5QGHNi4ymwyMwsvxA+hrinelkQP9Hyq8NHdNGOHfXJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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