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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1590d8de112f1c1c9cef608e64134406382a88f9e12591d11c6bb292c2568f61' 
  AND token = '0baVLa3BWsix9EHvS98tAH5d/AD7kXy4Jp/H7fak2QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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