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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb79edade8693aa3e89bd63f508a2b608aeb69766ea75cb1bc0de2cda9111923' 
  AND token = '6lF/+WvfO9yGrEUyZ7Ozxlqem/ccCPklvUrK1CB4ZQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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