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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e33f51f7b4621443d40ee180caef705fc8ec21a0f8658363c3fffdfd50064f31' 
  AND token = 'D7k3xRsThAXkzO/C+q5SDRoBEaE4SJ9BfSzNjsr8AcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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