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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35eca91fd191f36510aec9f0d615c627e6a8f91e0383c36bc9e128f6db188c10' 
  AND token = 'MXSXUI48QuF4Yc1jEGNNDa3qgiHQ15XhqB53/vHbN/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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