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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5517da83a95e47c3378e249273c3d4c9466b30aa6348348728780d648f23def' 
  AND token = 'lUuftCXKcQNY7Qeme2VA/KMeNhszFe1P5Z+bOpN9h74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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