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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60ec4cf1a8d5c8aac70994c1d2f2ba31b5477e1292b85f46f7f2f641d5965a11' 
  AND token = '5oG+4vZFpWvm6VP0qadThNF6/fIRNtb5NSzOoGWv9IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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