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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0be3437ba21ddc06a7a490b3ad7c1df7f1e2827106981f0d1e1c7ec45d42c008' 
  AND token = 'qhbhx7RAdLF44fQmI6SBA34x/hF9UhSvxW2hK0qQjIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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