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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e16281f3142e2b89a69e561cda143f9841b178580fb0202b8ed7d034d217294' 
  AND token = 'J11vphHz2F8dJ/EKp4/W7a9VmB/1/NRFc51dCdIweBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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