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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad1d6d55bb82e38589ab4332d02c06cc469af9d3c8461d0c90e2ce14b07c7d6b' 
  AND token = 'n9jjj6lRyNI025sxAO9al1iKlAL2PlvIelZTqXR/NJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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