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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b52b11c4dde78385605f85f7c9f2127072a21371886f4ce1ec316b8a69f2e8f8' 
  AND token = '9Ddw3JE7yBcagkqevKglWCtO4ooce7IoV1mYATEMRA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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