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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fac4e42e897ccf9058ec5cb878636165dc5fb9426d9e928704c5fa9f8ab35067' 
  AND token = 'hNFHRYTcumZCEtpde5o+IJn6NCN413FBi6qVL8ID+ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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