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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad691f3e982c24fe66e693ea8f09688276e0a38563b20fed44f9581f956cf6ef' 
  AND token = 'tyDaSV4EYZDSeC/abk+zE8nfn3FSJXh2G9URulJMFMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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