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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f1753264350c62d8b93dddfa1162646c5420d45c129b1dcbff54c62740602ea' 
  AND token = 'SiYYPa91eYS5fQFmmz2PxZ2db/yls2mmKlHZ9LTRa64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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