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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '146ed005b02dec01d0dcd00eefc0bec9dc0a8eb11286d03e49854d613d15a81f' 
  AND token = 'Rm/cGpV2caEkXlgXmHRqOZmHnaIqoz/D9+TEAmjQOc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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