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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de9ad2eb1f4e98c72ce1bf7501beb78a76711963159ef8fe0cfe6380ce1577bb' 
  AND token = '8bVRWOorxtY3RFEM8ik1WguvJjMOsiVvKICQ127L7Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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