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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd68b0844ebdab17822dd4192322c9c1438944b2a88c781de6534e641b485ba50' 
  AND token = '35xAd9mCqSusi0AmENpObXvt0jvBiQSSLJlm92b1+No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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