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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79561e1ad10b3450bddfaf8799c8829a04cbb2bfe45be2e2b8dfde672fdf3af9' 
  AND token = '/XjC10pbUbc0kPOWZpSWCTlJAL1v/KXZSaNCS2Bz9XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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