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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1422d6c1307158ee75b893ad52f77ee0ff288bbe9bde79fc1cef623aa9fe6ee' 
  AND token = '5l3xdvSUdejrSUPajGPG3nbS4sLYJKiD5a0CML0ceEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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