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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a37b6892d45422846d285fa3365525a32f2a077be425f46f29ab9fe5b46a9795' 
  AND token = 'XSpXlftkFjsKZ9o6cSqDIGjodrpClElmTnPm2iC7rOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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