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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af782b5220dca296603e55cd7dfe87a031475253826d8fb296a746e222b7432a' 
  AND token = 'rf0Me1R1TWRddPfjtvdIgzp61vGLOxVfb0ssBKHYMcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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