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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cacd83122c980f283b72b270f1a27a388d1700c0fbd1aa93cc492f85ad6d8b77' 
  AND token = 'c1llUwLZMDxbL6Ff6w6MLQGqIHXW0msKz+SN52G2KKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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