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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f53fbcb8176dab9f2349ef5312e54000e93d05413f20b028e4eb9e1ab9f5b24' 
  AND token = '6gMT/Urib4qkWV1ANfBTdBBH0ZqfNemg9xk34py625I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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