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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a5183e22770b5ab79176e73bac60cd62c16023d31294cbdfdbe387407923668' 
  AND token = 'CwOm1w54Ql0zM9RSL90qrrnRE76mDP3axvFQa7lZ7BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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