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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d368707aa2af770ef7dd470e0e9c17fa3a120bb43f968055fb812b7f0363c54' 
  AND token = 'pnzp7n6eXDK6woN07TVFul2yCGljPF+dWPTBQnXGyGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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