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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b63809eb2096fcd0cb7eb3dda0fd6ec8d36ef9a1b7a0c4207f48528eacf5113' 
  AND token = '+JNC7R2R1zn3zqKKLtieMNpX+8q/b2If2n0nZnk3wzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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