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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adf3f936092db65ed5aab3101e89ebc8440217e24b5cb8d3e3b11460d8d2a181' 
  AND token = 'BP87jLbtqTFwShuW8VgW1QR+H+Pcdpc0TAu3PrxCuhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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