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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66c9385c5949c04d93527ff0b36d5fcee8f524e967e726d86f04af7af32f2e8b' 
  AND token = '13B0vsvYdYGaZ6mqiAFva20oBkv5eZ452WeqhfxCOJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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