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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71a81861742e63ced623f3a90652a04603dcb06c8c92f653817cc1acd0e9d31a' 
  AND token = 'R3ZdH/etUNbGfgkFMp+fip9Ippm63R3OD0v1ev4CMV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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