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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d447a397d1edc26a81d9fc8782dba57d9068eee321d41a516f67a487ed6463b' 
  AND token = 'CaNxkA3yiKkOlCGAM8/ixBwA2Ub0lcxjU+2WY5SeObQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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