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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9832276db4718fc4e363c199ca84057abe4a3b45a394373c482bf18d00e7a90' 
  AND token = 'TO7vlxQuR6RzsD97imKaFDLjgsE991lBIXvObFYomz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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