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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '511e78067d7d2f1379159f723076731e360c4161a3f3de03172350ed6aa97ea5' 
  AND token = 'H3/GnpXMdlkpydUL5izxwNwEg995qw0jXZWvqfE9GmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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