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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0247da33bdd0eb6907569b2e8012efda07536bfa89f2c3636770775a407da4d2' 
  AND token = 'iOI/wDnjdYc21aPdBUBBkwkLug07AealIJTYg9SzAI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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