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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b468b3f6159d1fd94759519d3da75a9f82137c99bc7ef41cd0e8e18bc98149f' 
  AND token = 'jrHVwP51CAx/9am4UbBd0PEP33IZpTijEqCer8CBCUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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