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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a086703922711da69ce455d8b2f42c22ab07b2940ac49812be5dda4c92d2daa9' 
  AND token = 'SSm0nRF912w73/jhRFO57CzoZCiTEiCgrHU2gZnFdoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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