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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb5ee161b4014d0585e44a1217612169ae97a1ae53bb7b8ecf8c9a663b701635' 
  AND token = 'wsXK/Ky6aCWFSMvFuFjnjSXPiRmqIr1ewG3AKPgEJ0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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