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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1dc71e67b597ac3e08ab9862038a1de709babad8b6c39a2878d0b38bffc399c5' 
  AND token = 'hRN+r0vIpNHnBr8qCuRwALBlnmlxoqfp/tzr46asTpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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