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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dd2d7bcb16393a223108746ab20c4ed7b940f4a303ac87aeca518900879fa0a' 
  AND token = 'KHe4R7Fd5Jg9IAIJn5EGnmxxPsLIy0a+v8BNi2YrntY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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