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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93e55809e6d10c7bf0b37f5d256d785ee54871e69bfff90b77c9f702d24a0081' 
  AND token = 'oearArL0ITpkd/KyU70G7jAYd6aW+Sb8LxOFH9SQFyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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