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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47dbdfb15fecb21a4a641ac76334cc21d72744f2e600f2c47f30346587e6a5a9' 
  AND token = 'tEiFoBJENpzmPpk7l9bBX6U2rmZmNWVFS3ky2KvVjRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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