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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'decf53348145795647b4d6c3fc241a4a1c1d49229d8d619a1c93db6ce51dba2d' 
  AND token = '/Ah9AmYNUn0kIWDCw9kiIN0okdrxXTKsbvf+eZ5sluk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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